On Fig. 6.1, place the letters X and Y at the mid-points of two rarefactions.
(b(ii))[1]
State, in terms of pressure, what is meant by a rarefaction.
(c)[3]
Calculate the distance between the Earth’s surface and the Moon’s surface.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “liquid $1500\text{ m s}^{-1}$; solid $5000\text{ m s}^{-1}$; gas $300\text{ m s}^{-1}$” …